Likely a dozen. Your bigger limitation is the damage cards, "A" deck in particular, which can be mitigated by buying a Duel Pack for your first two planes. That second damage deck opens things up considerably.
Newbie here..so excuse my confusion.
Doesn't the WW2 version of WoG use damage chits, and the WW1 version use cards?
Does an extra copy of damage markers (Chits or cards) come in handy with both versions?